Abundance ratios of nuclear spin isomers are considered as a powerful tool to investigate physical environments where molecules formed and have experienced in space. In this article, the author would
introduce the study on the molecules of cometary
ices in our Solar system which was formed 4.6 G
years ago, and also introduce other studies related
to the nuclear spin isomers of some molecules in
the universe.
Key words: nuclear spin isomer, infrared spectroscopy, astronomy
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